Replacing a Cold Air Conditioner Fan Motor

Update:23 Aug 2021

You have probably seen your air conditioning unit's fan […]

You have probably seen your air conditioning unit's fan motor. It is one of the most important components in your whole cooling system. If it malfunctions, you could end up with serious problems such as having a fatal heating failure or circuit breaker tripped. This article is going to explain why you should keep your fan motor in good working order. Just take a look at the following tips and advice.

The primary function of the air conditioner's fan motor is to maintain the correct compressor rotation speed of your condensing unit. Its primary function is to regulate the flow of refrigerant that passes through the condensing coils of the AC system, which keeps your house cool. When the fan blades and the condensate flow at different speeds, the refrigerant gets "crowded" and expands into a volume that is cooler than the ambient temperature. This causes the AC compressor to work harder to maintain the right, cool temperature for your house. So when this happens, it can lead to some very real consequences.

What can happen when there is too much hot air in the outdoor condenser unit of the A/C system is that the cooling effects of the refrigerant become less than desired. The expansion of the refrigerant gas causes the inside of the AC system to get warmer than the outside air. This effect can cause your conditioner to work harder to maintain the same temperature indoors as it is outdoors. The end result is that when your fan motor becomes overworked, it could cause it to burn out or worse - melt away the exterior aluminum condensing surface.

Fan motor overloading can be caused by both extreme hot and cold weather conditions. Extreme hot weather conditions cause the AC motors to work much harder to maintain a set temperature outside than it would inside. This causes your fan motor to become "hot", and it cannot cool as fast as needed to prevent overheating. When the fans are working hard, they produce more heat than they actually need to. So while the outside temperatures may be cool, your AC system is overheating and your fan motor needs to work much harder to maintain the same temperature inside.

Conversely, extremely cold temperatures can lead to your fan motor becoming "cold". This condition can occur when there is a leak in the refrigeration lines from the inside of the home. As the leak cools, it warms up the AC motor. The problem can only be repaired by opening the refrigeration line and making sure the cool air is able to pass through the refrigeration lines. If the refrigeration lines are not leaking, you will just have to wait until they are. Repairing a frozen motor may cause more problems if not done properly.

Overheating conditions can damage many types of cooling and air conditioner fan motors. The price of repairing one of these motors is much more than replacing it. It can be much more cost effective to replace the air conditioner fan motor than it is to repair it. In many cases it can be less expensive to buy a replacement than it is to repair a fan motor that has become too cold.